MSVC 出错++带有扩展iostream
我正在为我的应用程序编写一个输出管理器类，虽然我的类可以在 linux 下的 g++ 上运行，但它不会在 MSVC++ 2010 下编译。
这是我的程序的 SSCCE 版本：
#include <iostream>
#include <malloc.h>
#include <sstream>
#include <fstream>
template<class cT, class traits=std::char_traits<cT> >
class BasicE3OutStream: public std::basic_ostream<cT, traits> {
public:
BasicE3OutStream() :
std::basic_ios<cT, traits>(), std::basic_ostream<cT, traits>(0), mBuffer() {
resetModifiers();
mLineBuffer=(std::stringstream*) malloc(sizeof(std::stringstream));
mLineBuffer=new (mLineBuffer) std::stringstream();
}
BasicE3OutStream(const BasicE3OutStream<cT,traits> &) {
}
virtual ~BasicE3OutStream() {
delete mLineBuffer;
mLineBuffer=NULL;
}
void resetModifiers() {
mDebug=false;
mMemory=false;
}
void open(const char* fileName) {
mBuffer.open(fileName, std::stringstream::out);
}
void close() {
mBuffer.close();
}
template<class T>
BasicE3OutStream& operator<<(T val) {
(*mLineBuffer)<<val;
return (*this);
}
BasicE3OutStream& operator<<(char* val) {
(*mLineBuffer)<<val;
return (*this);
}
BasicE3OutStream& operator<<(std::string val) {
(*mLineBuffer)<<val;
return (*this);
}
void addLineFeed() {
std::string modifier;
modifier="";
if (mDebug)
modifier+="[DEBUG] ";
else if (mMemory)
modifier+="[MEMORY] ";
mBuffer<<modifier<<mLineBuffer->str()<<"\n";
mLineBuffer->~basic_stringstream();
mLineBuffer=new (mLineBuffer) std::stringstream();
resetModifiers();
}
void flush() {
mBuffer.flush();
resetModifiers();
}
void setFlag(int f) {
if (f==0)
mDebug=true;
else if (f==1)
mMemory=true;
}
public:
std::basic_ofstream<cT, traits> mBuffer;
std::stringstream* mLineBuffer;
bool mDebug, mMemory;
};
template<class cT, class traits, class T>
BasicE3OutStream<cT, traits>& operator<<(BasicE3OutStream<char, traits>& str , T val) {
str.operator <<(val);
return (str);
}
typedef BasicE3OutStream<char> E3OutStream;
template<class charT, class traits>
BasicE3OutStream<charT, traits>& endl(BasicE3OutStream<charT, traits>& os) {
os.addLineFeed();
return (os);
}
template<class charT, class traits>
BasicE3OutStream<charT, traits>& flush(BasicE3OutStream<charT, traits>& os) {
os.flush();
return (os);
}
template<class charT, class traits>
BasicE3OutStream<charT, traits>& debug(BasicE3OutStream<charT, traits>& os) {
os.setFlag(0);
return (os);
}
template<class charT, class traits>
BasicE3OutStream<charT, traits>& memory(BasicE3OutStream<charT, traits>& os) {
os.setFlag(1);
return (os);
}
/**
* Io manipulator, allows to use endl and other modificators
*/
template<class charT, class traits> BasicE3OutStream<charT, traits>& operator<<(
BasicE3OutStream<charT, traits> &s
, BasicE3OutStream<charT, traits>& (*iomanip)(BasicE3OutStream<charT, traits>&)) {
return (iomanip(s));
}
int main() {
E3OutStream s;
s.open("output.txt");
s<<debug<<"Debug info"<<endl;
s<<flush;
s<<memory<<"Memory info"<<endl;
s<<flush;
s.close();
}
它在 g++ 中运行良好，但是在 MSVC 上我得到一个编译器错误：
1>------ Build started: Project: sscce, Configuration: Debug Win32 ------
1> main.cpp
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(129): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(130): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(131): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(132): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
任何帮助将不胜感激， Guillaume
[编辑]
感谢我得到的这个建议，我能够意识到扩展 iostream 在这种情况下没有用，因为我已经有一个 ofstream 作为成员变量。由于我对 std 库的内部工作了解不够，所以我使我的类独立，并且它适用于 MSVC 和 g++ ：
#include <iostream>
#include <malloc.h>
#include <sstream>
#include <fstream>
class BasicE3OutStream {
public:
BasicE3OutStream() :
mBuffer() {
resetModifiers();
mLineBuffer=(std::stringstream*) malloc(sizeof(std::stringstream));
mLineBuffer=new (mLineBuffer) std::stringstream();
}
BasicE3OutStream(const BasicE3OutStream &) {
}
virtual ~BasicE3OutStream() {
delete mLineBuffer;
mLineBuffer=NULL;
}
void resetModifiers() {
mDebug=false;
mMemory=false;
}
void open(const char* fileName) {
mBuffer.open(fileName, std::stringstream::out);
}
void close() {
mBuffer.close();
}
template<class T>
BasicE3OutStream& operator<<(T val) {
(*mLineBuffer)<<val;
return (*this);
}
void addLineFeed() {
std::string modifier;
modifier="";
if (mDebug)
modifier+="[DEBUG] ";
else if (mMemory)
modifier+="[MEMORY] ";
mBuffer<<modifier<<mLineBuffer->str()<<"\n";
mLineBuffer->str("");
resetModifiers();
}
void flush() {
mBuffer.flush();
resetModifiers();
}
void setFlag(int f) {
if (f==0)
mDebug=true;
else if (f==1)
mMemory=true;
}
public:
std::ofstream mBuffer;
std::stringstream* mLineBuffer;
bool mDebug, mMemory;
};
BasicE3OutStream& endl(BasicE3OutStream& os) {
os.addLineFeed();
return (os);
}
BasicE3OutStream& flush(BasicE3OutStream& os) {
os.flush();
return (os);
}
BasicE3OutStream& debug(BasicE3OutStream& os) {
os.setFlag(0);
return (os);
}
BasicE3OutStream& memory(BasicE3OutStream& os) {
os.setFlag(1);
return (os);
}
/**
* Io manipulator, allows to use endl and other modificators
*/
BasicE3OutStream& operator<<(
BasicE3OutStream &s
, BasicE3OutStream& (*iomanip)(BasicE3OutStream&)) {
return (iomanip(s));
}
typedef BasicE3OutStream E3OutStream;
int main() {
E3OutStream s;
s.open("output.txt");
s<<debug<<"Debug info"<<endl;
s<<flush;
s<<memory<<"Memory info"<<endl;
s<<flush;
s.close();
}
I'm writing an output manager class for my application and although my class works on g++ under linux, it won't compile under MSVC++ 2010.
Here is a SSCCE version of my program :
#include <iostream>
#include <malloc.h>
#include <sstream>
#include <fstream>
template<class cT, class traits=std::char_traits<cT> >
class BasicE3OutStream: public std::basic_ostream<cT, traits> {
public:
BasicE3OutStream() :
std::basic_ios<cT, traits>(), std::basic_ostream<cT, traits>(0), mBuffer() {
resetModifiers();
mLineBuffer=(std::stringstream*) malloc(sizeof(std::stringstream));
mLineBuffer=new (mLineBuffer) std::stringstream();
}
BasicE3OutStream(const BasicE3OutStream<cT,traits> &) {
}
virtual ~BasicE3OutStream() {
delete mLineBuffer;
mLineBuffer=NULL;
}
void resetModifiers() {
mDebug=false;
mMemory=false;
}
void open(const char* fileName) {
mBuffer.open(fileName, std::stringstream::out);
}
void close() {
mBuffer.close();
}
template<class T>
BasicE3OutStream& operator<<(T val) {
(*mLineBuffer)<<val;
return (*this);
}
BasicE3OutStream& operator<<(char* val) {
(*mLineBuffer)<<val;
return (*this);
}
BasicE3OutStream& operator<<(std::string val) {
(*mLineBuffer)<<val;
return (*this);
}
void addLineFeed() {
std::string modifier;
modifier="";
if (mDebug)
modifier+="[DEBUG] ";
else if (mMemory)
modifier+="[MEMORY] ";
mBuffer<<modifier<<mLineBuffer->str()<<"\n";
mLineBuffer->~basic_stringstream();
mLineBuffer=new (mLineBuffer) std::stringstream();
resetModifiers();
}
void flush() {
mBuffer.flush();
resetModifiers();
}
void setFlag(int f) {
if (f==0)
mDebug=true;
else if (f==1)
mMemory=true;
}
public:
std::basic_ofstream<cT, traits> mBuffer;
std::stringstream* mLineBuffer;
bool mDebug, mMemory;
};
template<class cT, class traits, class T>
BasicE3OutStream<cT, traits>& operator<<(BasicE3OutStream<char, traits>& str , T val) {
str.operator <<(val);
return (str);
}
typedef BasicE3OutStream<char> E3OutStream;
template<class charT, class traits>
BasicE3OutStream<charT, traits>& endl(BasicE3OutStream<charT, traits>& os) {
os.addLineFeed();
return (os);
}
template<class charT, class traits>
BasicE3OutStream<charT, traits>& flush(BasicE3OutStream<charT, traits>& os) {
os.flush();
return (os);
}
template<class charT, class traits>
BasicE3OutStream<charT, traits>& debug(BasicE3OutStream<charT, traits>& os) {
os.setFlag(0);
return (os);
}
template<class charT, class traits>
BasicE3OutStream<charT, traits>& memory(BasicE3OutStream<charT, traits>& os) {
os.setFlag(1);
return (os);
}
/**
* Io manipulator, allows to use endl and other modificators
*/
template<class charT, class traits> BasicE3OutStream<charT, traits>& operator<<(
BasicE3OutStream<charT, traits> &s
, BasicE3OutStream<charT, traits>& (*iomanip)(BasicE3OutStream<charT, traits>&)) {
return (iomanip(s));
}
int main() {
E3OutStream s;
s.open("output.txt");
s<<debug<<"Debug info"<<endl;
s<<flush;
s<<memory<<"Memory info"<<endl;
s<<flush;
s.close();
}
It runs fine in g++ however on MSVC I get a compiler error :
1>------ Build started: Project: sscce, Configuration: Debug Win32 ------
1> main.cpp
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(129): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(130): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(131): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
1>c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(132): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(726): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(764): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(811): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(937): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(944): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(951): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(958): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(1085): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(43): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(char *)'
1> with
1> [
1> cT=char
1> ]
1> c:\users\guillaume\documents\visual studio 2010\projects\sscce\sscce\main.cpp(48): or 'BasicE3OutStream<cT> &BasicE3OutStream<cT>::operator <<(std::string)'
1> with
1> [
1> cT=char
1> ]
1> while trying to match the argument list '(E3OutStream, overloaded-function)'
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Any help would be greatly appreciated,
Guillaume
[EDIT]
Thanks to this adviceI was given, I was able to realize that extending iostream was not useful in that case since I already had an ofstream as a member variable. Since I don't know enough of the internal working of the std library, I made my class independant and it worked on both MSVC and g++ :
#include <iostream>
#include <malloc.h>
#include <sstream>
#include <fstream>
class BasicE3OutStream {
public:
BasicE3OutStream() :
mBuffer() {
resetModifiers();
mLineBuffer=(std::stringstream*) malloc(sizeof(std::stringstream));
mLineBuffer=new (mLineBuffer) std::stringstream();
}
BasicE3OutStream(const BasicE3OutStream &) {
}
virtual ~BasicE3OutStream() {
delete mLineBuffer;
mLineBuffer=NULL;
}
void resetModifiers() {
mDebug=false;
mMemory=false;
}
void open(const char* fileName) {
mBuffer.open(fileName, std::stringstream::out);
}
void close() {
mBuffer.close();
}
template<class T>
BasicE3OutStream& operator<<(T val) {
(*mLineBuffer)<<val;
return (*this);
}
void addLineFeed() {
std::string modifier;
modifier="";
if (mDebug)
modifier+="[DEBUG] ";
else if (mMemory)
modifier+="[MEMORY] ";
mBuffer<<modifier<<mLineBuffer->str()<<"\n";
mLineBuffer->str("");
resetModifiers();
}
void flush() {
mBuffer.flush();
resetModifiers();
}
void setFlag(int f) {
if (f==0)
mDebug=true;
else if (f==1)
mMemory=true;
}
public:
std::ofstream mBuffer;
std::stringstream* mLineBuffer;
bool mDebug, mMemory;
};
BasicE3OutStream& endl(BasicE3OutStream& os) {
os.addLineFeed();
return (os);
}
BasicE3OutStream& flush(BasicE3OutStream& os) {
os.flush();
return (os);
}
BasicE3OutStream& debug(BasicE3OutStream& os) {
os.setFlag(0);
return (os);
}
BasicE3OutStream& memory(BasicE3OutStream& os) {
os.setFlag(1);
return (os);
}
/**
* Io manipulator, allows to use endl and other modificators
*/
BasicE3OutStream& operator<<(
BasicE3OutStream &s
, BasicE3OutStream& (*iomanip)(BasicE3OutStream&)) {
return (iomanip(s));
}
typedef BasicE3OutStream E3OutStream;
int main() {
E3OutStream s;
s.open("output.txt");
s<<debug<<"Debug info"<<endl;
s<<flush;
s<<memory<<"Memory info"<<endl;
s<<flush;
s.close();
}
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评论（1）
问题的核心是您向流发送函数指针，GCC 似乎知道如何处理，但 MSVC++ 不知道。不管怎样，我怀疑你想保存
debug/endl/flush/memory函数的地址。下一步的解决方案是制作这些对象而不是您显示的函数。
然而，这段代码有很多错误。也就是说，已经存在您应该使用的
endl和flush对象。此外，每个BasicE3OutStream都有三个底层流，它继承自其中一个，所有函数都在该流上工作（包括endl等，我将其假设这就是您替换它们的原因），以及mBuffer和mLineBuffer（您所做的事情不需要这两个成员）。 （另一个旁注，使用 mLineBuffer.str(""); 重置字符串流，而不是放置新的）执行您想要的操作的简单方法是重载每个运算符<<
basic_ostream的 成员，只要有换行符，就适当插入[DEBUG]或[MEMORY]，没有需要缓冲。 （我已经做到了，这并不难）可能有一种正确的方法来做到这一点，通过使用具有不同字符特征的流，或重载某些虚拟函数，或替换缓冲区，但流是很复杂，而且我不知道这种正确方式。
The core of the problem is that you're sending function pointers to your stream, which GCC seems to know how to handle, but MSVC++ doesn't. Either way, I doubt you wanted to save the address of the
debug/endl/flush/memoryfunctions.The next-step resolution is to make those objects instead of functions that you display.
However, there's a lot wrong with this code. Namely, there already exist
endlandflushobjects, which you should be using. Also, eachBasicE3OutStreamhas three underlying streams, one it inherited from, that all the functions work on, (includingendland such, which I assume is why you replaced them), andmBufferandmLineBuffer, (neither of the members is needed for what you're doing). (Another side note, reset a stringstream withmLineBuffer.str("");, not placement new)The easy way to do what you want is to overload each of the
operator<<members of abasic_ostream, and wherever there is a newline, insert[DEBUG]or[MEMORY]as appropreate, there's no need to buffer. (I've done this, it's not crazy hard)There's probably a right way to do this by using a stream with different char traits, or overloading certain virtual functions, or replacing the buffer, but streams are complicated, and I don't know this right way.